DE898995C - Two-stage jet pump for fire extinguishing purposes - Google Patents
Two-stage jet pump for fire extinguishing purposesInfo
- Publication number
- DE898995C DE898995C DEA3952D DEA0003952D DE898995C DE 898995 C DE898995 C DE 898995C DE A3952 D DEA3952 D DE A3952D DE A0003952 D DEA0003952 D DE A0003952D DE 898995 C DE898995 C DE 898995C
- Authority
- DE
- Germany
- Prior art keywords
- pump
- jet pump
- backing
- fire extinguishing
- jet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/311—Injector mixers in conduits or tubes through which the main component flows for mixing more than two components; Devices specially adapted for generating foam
- B01F25/3111—Devices specially adapted for generating foam, e.g. air foam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
- B01F25/3121—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
- B01F25/3123—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof with two or more Venturi elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
- B01F25/3123—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof with two or more Venturi elements
- B01F25/31233—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof with two or more Venturi elements used successively
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
- B01F25/3124—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow
- B01F25/31242—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow the main flow being injected in the central area of the venturi, creating an aspiration in the circumferential part of the conduit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/32—Injector mixers wherein the additional components are added in a by-pass of the main flow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/834—Mixing in several steps, e.g. successive steps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/235—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids for making foam
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Jet Pumps And Other Pumps (AREA)
Description
Die Erfindung betrifft eine zweistufige Strahlpumpe für Feuerlöschzwecke, bei der die Idurch einen Nebenwasserstrom gespeiste Vorpumpe eine Zusatzfiüssigkeit, z. B. einen Schaumbildner für die Luftschaumerzeugung, ansaugt und dieses (;gemisch durch die Hauptpumpe angesaugt wird. The invention relates to a two-stage jet pump for fire extinguishing purposes, in which the backing pump fed by a secondary water flow is an additional liquid, z. B. a foaming agent for air foam generation, sucks and this (mix is sucked in by the main pump.
Es sind z. B. für den Zweck, strömendem, unter Druck stehendem Wasser gewisse andere Flüssigkeiten, z. B. Schaumbiidner, in bestimmtem Mengenanteil laufend zuzusetzen, Strahipumpen bekanntgeworden, bei denen ein Teil der Druckflüssigkeit vor der Strahlpumpe abgezweigt uad einer kleinen Hilfsstrahlpumpe zugeführt wird. Diese Hilfsstrahlpumpe, im folgenden Vorpumpe genannt, dient zur unmittelbaren Ansaugung der beizumischenden Flüssigkeit. Das aus der Vorpumpe austretendekonzentrierte FLüssip,5meitswassergemisch wird seinerseits in den Saugraum einer größeren Strahlpumpe, im weiteren mit Hauptpumpe bezeichnet, geleitet und dort mit dem Rest Ider Treibflüssigkeit vermischt. Kennzeichnend für die Vorpumpe ist, daß an der engsten Stelle ihres Treibstrahles der Druck niedriger sein muß als derjenige der normalerweise unter Atmosphärendruck stehemden Zusatzflüssigkeit. Der Druck im Saugraum der Hauptpumpe liegt, entsprechend dem im Diffusor der Vorpumpe erreichten Druckanstieg, erheblich höher. Steigt bei zweistufigen Strahlpumpen der bekannten Bauart der hinter der Strahlpumpe herrschende (Gegendruck, so bewirkt dieser Druckanstieg von einer bestimmten Höhe des Gegendruckes ab eine Verminderung der von der Vorpumpe angesaugten anteiligen Zusatzflüssigkeitsmenge. Dieser Vorgang kann im Betriebe störend wirken, wenn z. B. bei der Luftschaumerzeugung durch Höherlegen des Luftschaumstrahlrohres die Summe von statischem und dynamischem Gegendruck hinter der Strahlpumpe über dieses zulässige Maß ansteigt. There are z. B. for the purpose of flowing, pressurized water certain other liquids, e.g. B. Schaumbiidner, running in certain proportions add, jet pumps become known, in which part of the hydraulic fluid branched off in front of the jet pump and fed to a small auxiliary jet pump. This auxiliary jet pump, hereinafter referred to as the backing pump, is used for direct suction the liquid to be mixed. The concentrated FLüssip, 5meitwater mixture emerging from the backing pump is in turn in the suction chamber of a larger jet pump, in the following with the main pump referred to, passed and mixed there with the rest of the propellant liquid. Characteristic for the backing pump is that the pressure is lower at the narrowest point of its propulsion jet must be than that of the additional liquid, which is normally under atmospheric pressure. The pressure in the suction chamber of the main pump corresponds to that in the diffuser of the backing pump achieved pressure increase, considerably higher. Increases with two-stage jet pumps the known type of the prevailing behind the jet pump (back pressure, so causes this pressure increase from a certain level of the counterpressure onwards a decrease the proportional amount of additional liquid sucked in by the backing pump. This process can have a disruptive effect in the company if z. B. in the air foam generation by raising it of the air foam nozzle is the sum of the static and dynamic counter pressure behind the jet pump rises above this permissible level.
Um diesen Übelstand zu vermindern oder zu beseitigen, wird gemäß der Erfindung die Treibflüssigkeit für den Betrieb der Vorpumpe im Gegensatz zu der bekannten Anordnung dem Raum in oder hinter Idem Diffusor der Hauptpumpe entnommen, der im folgenden kurz Gegendruckraum genannt wird. Bei der Arbeitsweise nach der Erfindung bekommt also die Treibdüse der Vorpumpe von vornherein einen niedrigeren Druck als die der Hauptpumpe. Erhöht sich nun der Druck im Gegendruckraum, so bewirkt dieser erhöhte Druck im Gegendruckraum zwar eine Druckerhöhung im Saugraumlder Hauptpumpe, gleichzeitig wird aber auch der Treibdruck der Vorpumpe höher. Bei geeigneter Bemessung der Querschnitte der Vor-und Hauptpumpe kann so erreicht werden, daß bis zu einer gewissen Grenze der Gegendruck ohne Einfluß auf den Mengenanteil der geförderten Zusatzflüssigkeit ist. In order to lessen or eliminate this evil, according to the invention the propellant fluid for the operation of the backing pump in contrast to the known arrangement taken from the space in or behind the diffuser of the main pump, which is briefly referred to in the following as the back pressure chamber. When working according to the Invention, the driving nozzle of the backing pump gets a lower one from the start Pressure than that of the main pump. If the pressure in the counterpressure chamber now increases, this has the effect this increased pressure in the counterpressure chamber causes a pressure increase in the suction chamber of the main pump, At the same time, however, the driving pressure of the backing pump is also higher. With suitable dimensioning the cross-sections of the back and main pump can be achieved so that up to one certain limit of the back pressure without influence on the proportion of the conveyed Additional liquid is.
Mit Vorteil kann die Treibflüssigkeit für die Vorpumpe bereits dem Diffusor der Hauptpumpe entnommen werden, gegebenenfalls an einer Stelle, wo Ablösung des sich erweiternden Flüssigkeitsstrahles zu befürchten ist. Die Flüssigkeitsentnahme wirkt dann gleichzeitig als Grenzschichtabsaugung und verhindert so Idie Strahl ablösung und einen erhöhten Druekverlost. Advantageously, the propellant for the backing pump can already be the Diffuser can be taken from the main pump, if necessary at a point where detachment of the expanding liquid jet is to be feared. The fluid withdrawal then acts at the same time as a boundary layer suction and thus prevents the jet replacement and an increased printing raffle.
In der Zeichnung sind zwei Ausführungsbeispiele der Erfindung dargestellt. Two exemplary embodiments of the invention are shown in the drawing.
Abb. 1 zeigt eine zweistufige Strahlpumpe im Schnitt, bei der die Treibflüssigkeit hinter dem Diffusor der Hauptpumpe entnommen wird; in Abb. 2 ist ebenfalls im Schnitt eine zweistufige Strahlpumpe dargestellt, bei der die Treibflüssigkeit unmittelbar aus dem Diffusor abgezweigt wird. Fig. 1 shows a two-stage jet pump in section, in which the Motive liquid is taken behind the diffuser of the main pump; in Fig. 2 is also shown in section a two-stage jet pump, in which the propellant is branched off directly from the diffuser.
Tn Abb. 1 durchströmt die Hauptmenge der Treibflüssigkeit die Treibdüse I der als Hauptpumpe bezeichneten Strahlpumpe. Hinter dem Diffusor 2 der Hauptpumpe wird aus dem Gegendruckraum 3 über die kurze Rohrleitung4, in der sich ein Regelorgan 5 befindet, Druckflüssigkeit entnommen und der Treibdüse 6 der Vorpumpe zugeführt. Die Zusatzflüssigkeit gelangt durch den Stutzen 7 in den Saugraum der Vorpumpe, in deren Diffusor g der größte Teil der Geschwindigkeitsenergie des nunmehr vorhandenen Flüssigkeitsgemisches in Druck umgesetzt wird. Dieses gelangt schließlich in den Saugraum IO der Hauptpumpe, wo es mit dem Rest der Treibflüssigkeit vermischt wird. As shown in Fig. 1, most of the propellant liquid flows through the propellant nozzle I the jet pump referred to as the main pump. Behind the diffuser 2 of the main pump is from the back pressure chamber 3 via the short pipe 4, in which there is a control element 5 is located, removed pressure fluid and fed to the drive nozzle 6 of the backing pump. The additional liquid passes through the nozzle 7 into the suction chamber of the backing pump, in their diffuser g most of the velocity energy of the now existing Liquid mixture is converted into pressure. This eventually gets into the Suction chamber IO of the main pump, where it is mixed with the rest of the motive liquid.
Abb. 2 stellt eine weitere Ausführungsform der Erfindung dar, bei der fdie Treibflüssigiçeit für die Vorpumpe aus dem Diffusor 2 der Hauptpumpe durch Bohrungen 11 entnommen wird. Hierdurch wird die bei kurz gebauten Diffusoren vorhandene Neigung zur Strahlablösung im Diffusor hintangehalten und so ein sicheres Arbeiten der Hauptstrahlpumpe gewährleistet. Die Menge der die Treibdüse 6 der Vorpumpe durchströmenden Treibflüssigkeit wird hier durch einen Nebenschluß I2 mit Regelorgan I3 verändert. Fig. 2 shows a further embodiment of the invention at the propellant for the backing pump from the diffuser 2 of the main pump Bores 11 is removed. This is the existing with short diffusers The tendency towards beam detachment in the diffuser prevented and thus safe working guaranteed by the main jet pump. The amount that flows through the drive nozzle 6 of the backing pump Driving fluid is changed here by a shunt I2 with control element I3.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEA3952D DE898995C (en) | 1943-08-05 | 1943-08-05 | Two-stage jet pump for fire extinguishing purposes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEA3952D DE898995C (en) | 1943-08-05 | 1943-08-05 | Two-stage jet pump for fire extinguishing purposes |
Publications (1)
Publication Number | Publication Date |
---|---|
DE898995C true DE898995C (en) | 1953-12-07 |
Family
ID=6920385
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEA3952D Expired DE898995C (en) | 1943-08-05 | 1943-08-05 | Two-stage jet pump for fire extinguishing purposes |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE898995C (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2688709A1 (en) * | 1992-03-23 | 1993-09-24 | Schlumberger Cie Dowell | CONTINUOUS LIQUID ADDITIVE MIXER IN A FLUID. |
WO2000003794A1 (en) * | 1998-07-13 | 2000-01-27 | Bucher-Guyer Ag | Method and device for mixing fluids in a duct |
DE10327350B4 (en) * | 2003-06-16 | 2008-01-31 | Vogt AG, Feuerwehrgeräte- und Fahrzeugbau | Jet pump mixer and method for operating a jet pump mixer |
-
1943
- 1943-08-05 DE DEA3952D patent/DE898995C/en not_active Expired
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2688709A1 (en) * | 1992-03-23 | 1993-09-24 | Schlumberger Cie Dowell | CONTINUOUS LIQUID ADDITIVE MIXER IN A FLUID. |
WO1993018848A1 (en) * | 1992-03-23 | 1993-09-30 | Pumptech N.V. | Device for continuously mixing liquid additives into a fluid |
US5466063A (en) * | 1992-03-23 | 1995-11-14 | Dowell Schlumberger Incorporated | Device for continuously mixing liquid additives into a fluid |
WO2000003794A1 (en) * | 1998-07-13 | 2000-01-27 | Bucher-Guyer Ag | Method and device for mixing fluids in a duct |
US6495046B1 (en) | 1998-07-13 | 2002-12-17 | Bucher-Guyer Ag | Filtration apparatus and methods |
DE10327350B4 (en) * | 2003-06-16 | 2008-01-31 | Vogt AG, Feuerwehrgeräte- und Fahrzeugbau | Jet pump mixer and method for operating a jet pump mixer |
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